C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/30.5
C21D 8/00 (2006.01) F28D 19/04 (2006.01)
Patent
CA 1135163
D-3709 REGENERATOR SEAL C-3146 Abstract of the Disclosure A method for manufacturing a hot side regen- erator cross arm seal assembly having a thermally stabilized wear coating with a substantially flat wear surface thereon to seal between low pressure and high pressure passages to and from the hot inboard side of a rotary regenerator matrix includes the steps of forming a flat cross arm substrate member of high nickel alloy steel having free opposite ends thereon and a widened center segment to define side edges between the free opposite ends to define a variable width platform; grit blasting the substrate member at both the top and bottom surfaces thereof to clean the surfaces and to uniformly stress the member to a flattened condition; thereafter fixedly securing the side edges of the substrate member to a holding fixture with a concave surface thereacross to maintain the substrate member to a slightly bent configuration on the fixture surface between the opposite ends of the substrate member to produce prestress therein without exceeding the limits of elasticity of the member; applying subsequent layers of coating on the substrate member including a wear coating of plasma sprayed nickel oxide/calcium flouride material having a uniform depth between the opposite ends of the substrate member to define a wear surface of slightly concave form across the restrained substrate Abstract - Cont'd member between the free ends thereon; and thereafter subjecting the substrate member and the coating thereon to a heat treatment of 1600°F for sixteen hours to produce heat stabilizing growth in the coating layers in the substrate member and to produce a thermally induced growth stress in the wear surface that substantially equalizes the prestress in the substrate whereby when the cross arm is removed from the fixture surface following the heat treatment step a wear face is formed on the cross arm assembly that will be substantially flat between the ends thereof to closely conform to a flat inboard surface on a rotary regenerator matrix disc during operation of a gas turbine engine having turbine inlet temperatures in the order of 1400°F.
349033
Davis Leonard C.
Pacala Theodore
Sippel George R.
General Motors Corporation
Gowling Lafleur Henderson Llp
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